我想在我的 SD 卡中创建文件夹，我使用了下面的代码：
public class Screen extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.welcome);
operateOnFirstUsage();
}
private void operateOnFirstUsage() {
String state = Environment.getExternalStorageState();
Log.d("Media State", state);
if (Environment.MEDIA_MOUNTED.equals(state)) {
File appDirectory = new File(
Environment.getExternalStorageDirectory().getAbsolutePath() + "/MyApp/");
Log.d("appDirectroyExist", appDirectory.exists() + "");
if (!appDirectory.exists())
Log.d("appDir created: ", appDirectory.mkdir() + "");
File dbDirectory = new File(
Environment.getExternalStorageDirectory().getAbsolutePath() + "/MyApp/Database/");
Log.d("dbDirectroyExist", dbDirectory.exists() + "");
if (!dbDirectory.exists())
Log.d("dbDir created: ", dbDirectory.mkdirs() + "");
File themesDirectory = new File(
Environment.getExternalStorageDirectory().getAbsolutePath() + "/MyApp/Themes/");
Log.d("themesDirectroyExist", themesDirectory.exists() + "");
if (!themesDirectory.exists())
Log.d("themesDir created: ", themesDirectory.mkdirs() + "");
}
}
}
另外，我还设置了sdcard写入权限：
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
我已经多次运行该应用程序，每次都会得到 LogCat 输出：
01-09 21:38:13.701: D/Media State(15363): mounted
01-09 21:38:13.701: D/appDirectroyExist(15363): false
01-09 21:38:13.701: D/appDir created:(15363): false
01-09 21:38:13.701: D/dbDirectroyExist(15363): false
01-09 21:38:13.701: D/dbDir created:(15363): false
01-09 21:38:13.701: D/themesDirectroyExist(15363): false
01-09 21:38:13.701: D/themesDir created:(15363): false
我读过类似的问题，但没有得到任何有用的信息。我应该怎么做才能让代码运行？我的问题是什么？
Edited
尝试这个：
File mydir = new File(Environment.getExternalStorageDirectory() + "/mydir/");
if(!mydir.exists())
mydir.mkdirs();
else
Log.d("error", "dir. already exists");
并重新检查权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
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